Antigen: amino acids 234-249 of human SMAD2 . Host: rabbit . Cross Reactivity: (+) Bovine, canine, chicken, chimpanzee, human, mouse, and rat SMAD2 . Application(s): IHC and WB . SMAD2 is an intracellular protein that associates with SMAD4 for translocation to the nucleus. It acts as an intracellular mediator of the TGF(beta) family of cytokines and activin type 1 receptor, regulating multiple cellular processes like cell growth, proliferation, differentiation, and apoptosis and also cooperating with transcription factors to regulate expression of defined genes.